How is the Yoga Layout library connected to the React Native rendering system?

Question

Question progressNot startedReviewingMastered

Interview frequency: …

Answer 1

Short answer

Yoga is an open-source layout engine written in C++ that translates Flexbox properties into precise pixel coordinates (x, y, width, height) understood by iOS and Android.

Explanation

Since iOS and Android do not support Flexbox in their native interfaces, Facebook developed the Yoga engine to calculate complex layouts at high C++ speed inside the Shadow Thread, then send the final geometry to UIView elements on iOS and ViewGroup elements on Android.

Code example

// React Native Flexbox code is calculated by Yoga C++:
const styles = StyleSheet.create({
  container: {
    flex: 1,
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
  }
});

Common mistakes

Believing that a mini web browser (WebView) is responsible for calculating and applying Flexbox styles.

How is the Yoga Layout library connected to the React Native rendering system?

Short answer

Explanation

Code example

Common mistakes

Follow-up questions

Sources